{
  "id": "2107.10250",
  "version": "v1",
  "published": "2021-07-21T17:54:57.000Z",
  "updated": "2021-07-21T17:54:57.000Z",
  "title": "Constraining Cluster Virialization Mechanism and Cosmology using Thermal-SZ-selected clusters from Future CMB Surveys",
  "authors": [
    "Srinivasan Raghunathan",
    "Nathan Whitehorn",
    "Marcelo A. Alvarez",
    "Han Aung",
    "Nicholas Battaglia",
    "Gilbert P. Holder",
    "Daisuke Nagai",
    "Elena Pierpaoli",
    "Christian L. Reichardt",
    "Joaquin D. Vieira"
  ],
  "comment": "14 pages, 12 figures, 4 tables; to be submitted to ApJ; comments welcome",
  "categories": [
    "astro-ph.CO"
  ],
  "abstract": "We forecast the number of galaxy clusters that can be detected via the thermal Sunyaev-Zeldovich (tSZ) signals by future cosmic microwave background (CMB) experiments, primarily the wide area survey of the CMB-S4 experiment but also CMB-S4's smaller delensing survey and the proposed CMB-HD experiment. We predict that CMB-S4 will detect 75,000 clusters with its wide survey of $f_{\\rm sky}$ = 50% and 14,000 clusters with its deep survey of $f_{\\rm sky}$ = 3%. Of these, approximately 1350 clusters will be at $z \\ge 2$, a regime that is difficult to probe by optical or X-ray surveys. We assume CMB-HD will survey the same sky as the S4-Wide{}, and find that CMB-HD will detect $\\times3$ more overall and an order of magnitude more $z \\ge 2$ clusters than CMB-S4. These results include galactic and extragalactic foregrounds along with atmospheric and instrumental noise. Using CMB-cluster lensing to calibrate cluster tSZ-mass scaling relation, we combine cluster counts with primary CMB to obtain cosmological constraints for a two parameter extension of the standard model ($\\Lambda CDM+\\sum m_{\\nu}+w_{0}$). Besides constraining $\\sigma(w_{0})$ to $\\lesssim 1\\%$, we find that both surveys can enable a $\\sim 2.5-4.5\\sigma$ detection of $\\sum m_{\\nu}$, substantially strengthening CMB-only constraints. We also study the evolution of intracluster medium by modelling the cluster virialization ${\\rm v}(z)$ and find tight constraints from CMB-S4, with further factors of 3-4 improvement for CMB-HD.",
  "revisions": [
    {
      "version": "v1",
      "updated": "2021-07-21T17:54:57.000Z"
    }
  ],
  "analyses": {
    "keywords": [
      "constraining cluster virialization mechanism",
      "cmb surveys",
      "thermal-sz-selected clusters",
      "calibrate cluster tsz-mass scaling relation",
      "cosmic microwave background"
    ],
    "note": {
      "typesetting": "TeX",
      "pages": 14,
      "language": "en",
      "license": "arXiv",
      "status": "editable"
    }
  }
}